A remote sensing satellite is revolving in an orbit of radius x on the equator of earth. Find the area on earth surface in which satellite can not send messsage.

Answer

`[1-(sqrt(x^(2)-R^(2)))/(x)]4piR^(2)`

Explanation

the area on earth surface in which satellite can not send message
`=4piR^(2)[1-costheta]`
`=4piR^(2)[1-(sqrt(x^(2)-R^(2)))/(x)]`